Thanks for your answer. The link you suggested is the one I already saw and discussed in my first email. My question is about the meaning of "constant", since all the terms in my objective function are functions of variables (i.e.: none of them is actually constant). Also, I would like to know if there is any way not to let this shift happen. Thank you again for your time.
-- Mattia Buccarella On Fri, Jul 11, 2014 at 5:35 PM, Heinrich Schuchardt <xypron.g...@gmx.de> wrote: > Hello Mattia, > > please, read > > http://en.wikibooks.org/wiki/GLPK/Troubleshooting#Objective_shift_term_ignored_when_exported > > Best regards > > Heinrich Schuchardt > > http://www.xypron.de > > Am 11.07.14 um 17:20 schrieb Mattia Buccarella > > > Hello everyone, > > > > > > > > my name is Mattia and I am using glpsol in the development of my master > > > > thesis in computer science. > > > > > > > > I am writing to you all for something I could not find anywhere so far. > > > > When I use glpsol to solve my model (written in MathProg, with separate > > > > data input file), all the variables are configured properly as I expect > (I > > > > am referring to a "dummy" input I use to verify the correctness of my > > > > model). Nevertheless, the value of the objective function is shifted and > I > > > > get the following message: > > > > > > > > Model has been successfully generated > > > > *glp_mpl_build_prob: row obje; constant term 84384 ignored* > > > > GLPK Integer Optimizer, v4.52 > > > > ...etc... > > > > > > > > Searching the web, I found somebody had a similar issue but it was not > > > > related to the objective function and also involved CPLEX (context very > > > > different from mine). Does anybody of you know what is happening? When I > > > > try to solve the model (same model, same input) with COIN-OR Cbc, through > > > > AMPL, it gives me the non-shifted value. Also, it does not tell me > anything > > > > about constant terms in the function. Also, I checked again and again my > > > > objective function: all the terms are functions of some variable, so > > > > nothing is really constant in the calculation. > > > > > > > > Thanks in advance for your help. > > > > Goodbye. > > > > > > > > -- > > > > Mattia Buccarella > > > > _______________________________________________ > > > > Help-glpk mailing list > > > > Help-glpk@gnu.org > > > > https://lists.gnu.org/mailman/listinfo/help-glpk >
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